Created
January 26, 2012 01:50
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Lets play with decorators
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require "delegate" | |
class A | |
def self.class_meth | |
"class method" | |
end | |
def self.class_meth_with_args a, b | |
"class method args: " + a + b | |
end | |
def meth | |
"instance method" | |
end | |
end | |
# | |
#It works! | |
module DelegateWholeClass | |
#borrowed from Delegate.delegating_block | |
def self.delegate_block(mid, target) | |
lambda do |*args, &block| | |
begin | |
target.__send__(mid, *args, &block) | |
ensure | |
$@.delete_if {|t| /\A#{Regexp.quote(__FILE__)}:#{__LINE__-2}:/ =~ t} if $@ | |
end | |
end | |
end | |
end | |
def DelegateWholeClass(superclass) | |
klass = DelegateClass(superclass) | |
klass_methods = superclass.public_methods - klass.public_methods | |
klass_methods.each do |meth| | |
klass.define_singleton_method(meth,DelegateWholeClass.delegate_block(meth, superclass)) | |
end | |
klass | |
end | |
class T < DelegateWholeClass(A) | |
def meth | |
super + "<- from A" | |
end | |
def t_meth | |
"T:" + meth | |
end | |
def self.t_class_meth | |
"T class meth" | |
end | |
def self.class_meth | |
super + "<- from A" | |
end | |
end | |
t = T.new A.new | |
puts t.meth | |
puts T.class_meth | |
puts T.class_meth_with_args "bla," , 1.to_s | |
puts t.t_meth | |
puts T.t_class_meth |
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